Life of an SEO: Before, After & Beyond Penguin 2.1. It makes a bold, yet
practical presentation of the current SEO scene, by juxtaposing it
against the practices used in the pre-Penguin world. The infographic
provides a hands-on take on the effect of Google’s Penguin algorithm
update on SEO efforts, and reflects the state of mind of SEO
professionals post-Penguin 2.1.
Source: dotcominfoway.com